Simulation of electron diffusion in TiO2 porous structures in dye-sensitized solar cells

Kei Ogiya, Chen Lv, Ai Suzuki, Riadh Sahnoun, Michihisa Koyama, Hideyuki Tsuboi, Nozomu Hatakeyama, Akira Endou, Hiromitsu Takaba, Carlos A. Del Carpio, Ramesh C. Deka, Momoji Kubo, Akira Miyamoto

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)


    In order to understand the behavior of electrons in complex porous structures, we have simulated electron diffusion processes in complex porous structures that have been fabricated using a system for a three-dimensional porous structure simulator, POCO2. For a given porosity, as the overlap ratio representing a necked porous TiO2 structure increased, the coordination number of TiO2 particles increased, resulting in an increase in electron flux and a decrease in trapping time. To gain better insights, we simulated the diffusion of electrons using models with different particle size distributions. This study shows that for a narrower size distribution of TiO2 particles, a better electron diffusion process is realized. This result can be ascribed to the formation of a better TiO 2 coordination network. Consequently, through this study, we have shown that a well-formed neck between TiO2 particles improves the electron diffusion properties of a complex porous material.

    Original languageEnglish
    Article number04C166
    JournalJapanese journal of applied physics
    Issue number4 PART 2
    Publication statusPublished - Apr 2009

    All Science Journal Classification (ASJC) codes

    • General Engineering
    • General Physics and Astronomy


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